Servicing London, Windsor and surrounding areas. When making an investment as complex as your building's HVAC system, it pays to choose technical experts who are dedicated to your satisfaction throughout the life of the system - not just the sale. That's the promise, and the difference, of Total System Support from Trane. Because Trane provides HVAC equipment, controls, parts and service under one roof, we are able to offer cost-effective solutions that incorporate a total system perspective right from the start.